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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e88d3983f92d0211b3a1582122de7f27f07609b7d0540964dcdf8ec535bfca9' 
  AND token = 'ItR4kL8HIO4mmWdVjGhG8lAgZ4m1JydHy/a9IRDvmZA=' 
  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"
    }
  }
}