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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db8aa6d616442d9772335cf2f0431d2240e16df919c1962f16b65192bbc8ec23' 
  AND token = '0w9XNIlm8+Nvr012esUiemlbybaGfsjiNJocTE+zplo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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