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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b431cf5f2bd8dd7b83c3b91af202da787a62b1c2c64ecea141dca006f2ccb8' 
  AND token = 'chqXirzJy+goTR/5O1CwkKc0WZy2af2orizt8Sf8thc=' 
  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"
    }
  }
}