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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b948e7ff4cf1bb1f3e8de108b0d054162c09af19a5a764ff80e22f3e709d905e' 
  AND token = '/YknQrsyGG3jg+bsdAnGuZ1r4KkJww0Tdn/Z0t9B7PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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