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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea9c8d20a1ac80095649d1a4c0655d4ab3ae094fe0a49663848bd8b73fa42b2' 
  AND token = '9wbpzmThJP+k1sxA8YiIkEpErnSWa9c9c2VMzW9N02k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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