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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a4b5befd6976b08ce98f39f2bfed4e08c5b55257b2b1f8770c16307948a4ab' 
  AND token = 'whygzSPJPpk4DMMu0issFb7/OSx2wV6RnF/R2p1pulM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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