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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e65c0cd14ea5b696fe3d917463f4a46d74d6baf5b3836dad7e5c53f98f33b047' 
  AND token = '0EBzC2Np2D7aAQmoLh57I807Xl623pqvCqFpeUGhb8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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