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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c731e1a379c786ca3c4e3c131c397e28a52376252570c542b498084ab039d9f8' 
  AND token = 'rQrGDOBAclaFVccGHWIM2G2+TCFVirIqwK2FWGtSWTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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