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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd17ada348bbdaae374186c472aa40cb53a5b7c6fecaf04931b5f4d2a0863f1' 
  AND token = 'O6bOTZm0498Snv7N2O9WaW7+NyuFON9qmYgitS9h/Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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