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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a313d9b3e11c02c6bcde17e85b9ced0bbdd8426f000a0f1500d6684c8fc98e' 
  AND token = 'L2Bqu7c9A28d1AOw9ouafGUUtgZugk/r4CRxt2CFpB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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