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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd22ecb08b3ad328196689dcd89268ae33966ce0dc154fceda5b831b047f368' 
  AND token = 'J41/xBUp+3R16qsjypkpCgSe7yV+6WUmnpJdsJJCGNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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