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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d53f996b8bee60a7e15f5e6c976e0aec6e8cddaf736da260dd09851d997f673' 
  AND token = '1Qz+iLbu95IOjHCc0nLDbmr8btOgH/lycGYrAxLUT64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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