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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074303d3bd8ca932e7b40d020cb52aa20df56105179b266dc845fe2a54bb64e5' 
  AND token = 'QP/Zzw2NEpk4r7DTDhpJqkym24G6zrv2d5KmJdAM4hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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