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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d4ddf902ad69241c8d61cf2fd793a6535e4f5675b42d54d331bfb5d486134c2' 
  AND token = 'AtoZOr1rZ+AnPvIl8bYR2XFF9tsSPBDS+ieWZBApS/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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