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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d2ddc7bb942e0836d22086c12308502705e4fd2d2a2a09c5c02c2d841062fa' 
  AND token = 'Oi8CzZu3Ku8V0QzABsasOM/vt41qjiKIguKyuCt/HMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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