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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84f7231d7180d319ef6528f97b77f9bb2382f87e4b3511034c15419e6401e73' 
  AND token = 'pX5WD6MF3F40glC+wBYssLtfr/O1P3yrpTHvQn1Pxp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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