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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a069a6457bb7bbb129d53d27f30592eebbf7f16fa1b1a0f17de0b5c7e9932158' 
  AND token = '08xRQnoi/YXU8fx8E2upKkpa2NuvzKML7J25Qm2GBmA=' 
  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"
    }
  }
}