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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f50c2e8e0a400a12886a1df03b26c41fbd2f3e6d5fb65f9a22d5f0d8f2670251' 
  AND token = '+Bs9dBgTCh+1+DtKHzR9HJlc8TGblWuTW6gJIQu4S4A=' 
  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"
    }
  }
}