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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a2a5863b1ed4671d130c8dd2233b922d65593773e7b91361dcb45463e8e653' 
  AND token = 'A5cowYOsckCH5BJwNDlnml6G3Oo9PLhpCg11k89ZmlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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