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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05502000ff3298c31d231b1ceff8f83994717a01da91a7a9e4007d40ad8137e0' 
  AND token = 'w+h35/OmM+K4Xtf++oL9F56jW6V03C7Kn5Es91DyCcU=' 
  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"
    }
  }
}