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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0af66c4880a0b60f1d5eb097a4793344dd76debe64ce9af6df7f02708631516' 
  AND token = 'HcuPF+op6qJ5eO62Z1C9pEwFb6zH1aDxzWTLsYqGL7o=' 
  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"
    }
  }
}