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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb8b98e37883e9febfc8d361ccb461aa8c7ed35f1412d869c32212f8e6abb87' 
  AND token = '1fbhHPY5dcqDIwNXloVuZwnRF0JadKxN81dgiOREhNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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