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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d44a87d1e002e7275b8eb060662b4d2e65898ee73f3a361bc988a72b810a1c' 
  AND token = 'ed8FIqyinEaxOoCNOwTvXjQ+TNe7f/hvEavBP2k24xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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