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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf93104072bd3ca9d700f4693b41e31e5323a8a9606b4f6d3bc7102ad4d721bd' 
  AND token = 'Bvbmr9Kduk5MN4/6IVlkJVJm0RMvLIxK/TLo3VYdQE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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