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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0b4c8d9e45eff73fef06f46e89f9e8e60e5e1f2c1a8c7ab712e8c0f9e5ff795' 
  AND token = 'xzg092a1iOYhG36Lta0VslQ+qviA46eKi7vfak4xiHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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