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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82540e776af2a09a644db89169fbe6b2dda706d6d99ec5c2c42beaee2a6fbffc' 
  AND token = '30C4Q4Gp9vXYbn9QgS7fIOYY/Kwu4FmB5fzdtgiGvlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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