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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1232607e7cac1433553b50dcd7074cc62455689e282aa8b0c74ac810a74a2df1' 
  AND token = '5FZekju1I2y+/UFM/5P9XFPmAFgn6JzLntgFXDgf7p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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