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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7aaa5ba7a12d9c34902bf001c98c1a02a1bb6bffc3132ffb49b36bc4ac05f90' 
  AND token = 'FRncPa67Fgo2gLNKig6OeUHvGufQNMboN7C6irG3G1c=' 
  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"
    }
  }
}