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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20050fb2fdd6b96d4c73e264df61dfaabaf73c6f0f33595ce493cf54b5e27bc9' 
  AND token = '0jYbwlRIeuV3Ttf2QGlMj/cGtKcgMF1k2elasNFzUrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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