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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1e7f88fca56e9548b8e7beea8b1ff6abdddf597de5ba9f7039b85b33564e67' 
  AND token = 'PNnTnwm0t+8jIDHHeK/kWZD6tli7x/Z2Mz0plUaJ/a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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