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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ede7f2de0d16105a6872d727d0d443dd75f3560a546865be885d3e368eb19f82' 
  AND token = 'LEqevfKnV5BLcIgf1VL1QDaumqD3f4cCjpKCAKV+30I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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