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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1bf3d3e9d161450de23e418834b159e0778f18445cd5971ad0c68361806c106' 
  AND token = 'IAfGg928KNCfWJORDYWSHHPwf6iOi9je1F+ofqNk+sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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