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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f916c31a64e4368caa793091a48dbaac1d51f90b7acd536c0e08b4f843925be6' 
  AND token = '6gdGWpV3QNhKABdSFdRO6iZXdszwchryJet8ifzHb14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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