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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a9fbcc2d41bcc8f76ed4858950110dd1ab3a305a1c5ed0422046c160d2cbdf3' 
  AND token = '+nxDHIvA/E+isrLjDACwvvp9/UESERMRenqbdy+mLVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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