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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc23be5977b3eab448994ff377ed3a7944513a2a23e5f852583baa26263d5e16' 
  AND token = '8zQABDrNSn+7riNvGsbe+HMlk37b/oQQ7sHS45Bg198=' 
  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"
    }
  }
}