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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55dab6c8fe4a234c67c5f958f0079084a6a0ef6e1653653092c4fdb16f153e7c' 
  AND token = '06BjoodyG24FZvS6cRQSeYwSJqxz/zyeLPBdt3GnW8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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