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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e259e962bce03e22a7a2f633262f7a6e41423dd172f7c06fef2606671d8faf' 
  AND token = 'GDVYTyr2oM+GmefCw7SA3A1f9/An7A02aCPcHhDS8Y0=' 
  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"
    }
  }
}