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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e78dc52193db16037b350170b512cb6b08e0a487194571d2da8fd2a7219cd3a1' 
  AND token = '8MBsWCLiazG4Vw0K3NTGc95Yi7RGErbpB3SrXq6C6LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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