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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '362e0a1b1ca24719b4fb4493320a94543a746c612adf881ac26e3fdf7f49f41b' 
  AND token = 'IdZK9k5co0R1DOGMR2cp9SKjZUqLLtGMCkxlPTuhxgo=' 
  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"
    }
  }
}