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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fd9371c2221ceff425f744954189e882eb5a5728b17a271a5675e90f5525c2e' 
  AND token = 'P1/RehHcAh1aSwK9ZpGwfaeCFXqrXdrOdHu/QGnltRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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