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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d0a29e700a6764265667d8477dc815e79bd0682e70c0f14ee187ec1327c3b5' 
  AND token = 'hvZ0tr1i9PkRLtmm2QmaYM1rs+po2btHNFR4Pv8VSq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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