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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd163b7878ce77d5bb3e4f8e7f6690bcfb209d36c4457a90a39ea93d2bffc05' 
  AND token = 'YsKg43UNV5kT0LOKefBsbTc/lywFgwMtP6F4oerDtvA=' 
  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"
    }
  }
}