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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bcb8f2eb7349f551c12fdc3a96013bdb1addf3b1aa5caf5437a63b562633c62' 
  AND token = 'HrNsTEkW8/oNJVVING/Vx68pAr9Flqo6vi6/VHxALGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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