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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c00a89c3352dc29e512ba9aaac6819179d04f01f0332d62dc0ed7587bb319139' 
  AND token = 'V4WvQIcGUGrfwfSyKRE9x20DApKiz6E4OxO4/ZLD6mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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