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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717995f7b19029e5da7c02726374d0f00d219aa6aa8c98fb55b4c85c611d7a93' 
  AND token = 'qm75FRJa4zTInkletU+updhRHnM56riRoYHfozjTQ5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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