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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa42b8b5570e5dfb0f58e55b79a04d6c908c3180e6b18446a06e772d522a63b' 
  AND token = '/1nqGrb9zm28jkP7/G9o2PX1w8arciqUb6fthbTg7H8=' 
  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"
    }
  }
}