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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00eb510be4ba5173a5399883642c93a35f4e422f391535c5a0752dbe53bf3224' 
  AND token = 'JfnXPKne41KpqhDHMfSvEYcQUTQpmst14fT+Bolm7qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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