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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1248c1cf8fd2ad1219cbfc2fce9425ec6ef8d42c09ed5878ae05baa3a8684ce' 
  AND token = '/X0wnlS+53S5q6gPuEGDqOEwU8mDEVHVuxxEiv0wjso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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