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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6150ed47bc62f6e723a06484eb6a6841d532a6ed5f49ee9029e01ffec3ee95f1' 
  AND token = 'AxIIeJfu8+3bYvl2uaZhtbdR8F5i/q5h1ZprGTQo/Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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