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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b1b7a27445cd57ab560454bbfc0b56b686045f8a7593da241aa23d63af9cd31' 
  AND token = 'yFL87K6jTkFASHsz4rQrHyoAObVTTaST2BbQVEC078o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}