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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc7ab534697585eed6c9cb0adc0af035bbcc35fa16adcc8c854b9a98de28b00' 
  AND token = 'm9Cv6G0lnv4V+eVswIB8SCA3LJP+PY2BODsohDvr4V4=' 
  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"
    }
  }
}