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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2894482b7a1ccf1f56f75ba1a9a3f9c7ca0c04931fea8b9a6f5d48b2aa7aae52' 
  AND token = 'zEvZPUc5TjLyA10kSucD0yEf4389ZMHzwB8q0Uj50xM=' 
  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"
    }
  }
}